diff --git a/test/e2e/conftest.py b/test/e2e/conftest.py
index ac6e0bb9d..353ccf6f7 100644
--- a/test/e2e/conftest.py
+++ b/test/e2e/conftest.py
@@ -1,3 +1,4 @@
+import shutil
 from pathlib import Path
 from typing import Any
 
@@ -14,14 +15,18 @@
 
 
 @pytest.fixture()
-def app_params() -> dict[str, Any]:
+def app_params(tmp_path: Path) -> dict[str, Any]:
     cores = initialize_cores(use_gpu=False, enable_mock=True)
     tts_engines = make_tts_engines_from_cores(cores)
     latest_core_version = get_latest_core_version(versions=list(tts_engines.keys()))
     setting_loader = SettingHandler(Path("./not_exist.yaml"))
-    preset_manager = PresetManager(  # FIXME: impl MockPresetManager
-        preset_path=Path("./presets.yaml"),
-    )
+
+    # 隔離されたプリセットの生成
+    original_preset_path = Path("./presets.yaml")
+    preset_path = tmp_path / "presets.yaml"
+    shutil.copyfile(original_preset_path, preset_path)
+    preset_manager = PresetManager(preset_path)
+
     return {
         "tts_engines": tts_engines,
         "cores": cores,
diff --git a/test/e2e/single_api/__snapshots__/test_add_preset/test_post_add_preset_200.json b/test/e2e/single_api/__snapshots__/test_add_preset/test_post_add_preset_200.json
new file mode 100644
index 000000000..3c2df076c
--- /dev/null
+++ b/test/e2e/single_api/__snapshots__/test_add_preset/test_post_add_preset_200.json
@@ -0,0 +1 @@
+9999
diff --git a/test/e2e/single_api/__snapshots__/test_delete_preset.ambr b/test/e2e/single_api/__snapshots__/test_delete_preset.ambr
new file mode 100644
index 000000000..aed06a4e5
--- /dev/null
+++ b/test/e2e/single_api/__snapshots__/test_delete_preset.ambr
@@ -0,0 +1,4 @@
+# serializer version: 1
+# name: test_post_delete_preset_204
+  b''
+# ---
diff --git a/test/e2e/single_api/__snapshots__/test_update_preset/test_post_update_preset_200.json b/test/e2e/single_api/__snapshots__/test_update_preset/test_post_update_preset_200.json
new file mode 100644
index 000000000..d00491fd7
--- /dev/null
+++ b/test/e2e/single_api/__snapshots__/test_update_preset/test_post_update_preset_200.json
@@ -0,0 +1 @@
+1
diff --git a/test/e2e/single_api/test_add_preset.py b/test/e2e/single_api/test_add_preset.py
index 769bcfe69..c352812ad 100644
--- a/test/e2e/single_api/test_add_preset.py
+++ b/test/e2e/single_api/test_add_preset.py
@@ -2,12 +2,13 @@
 /add_preset API のテスト
 """
 
-import pytest
 from fastapi.testclient import TestClient
+from syrupy.assertion import SnapshotAssertion
 
 
-@pytest.mark.skip(reason="プリセット追加が他のテストに干渉するから")
-def test_post_add_preset_200(client: TestClient) -> None:
+def test_post_add_preset_200(
+    client: TestClient, snapshot_json: SnapshotAssertion
+) -> None:
     preset = {
         "id": 9999,
         "name": "test_preset",
@@ -22,3 +23,4 @@ def test_post_add_preset_200(client: TestClient) -> None:
     }
     response = client.post("/add_preset", params={}, json=preset)
     assert response.status_code == 200
+    assert snapshot_json == response.json()
diff --git a/test/e2e/single_api/test_delete_preset.py b/test/e2e/single_api/test_delete_preset.py
index 0baa3bd76..bebed0e3f 100644
--- a/test/e2e/single_api/test_delete_preset.py
+++ b/test/e2e/single_api/test_delete_preset.py
@@ -2,18 +2,16 @@
 /delete_preset API のテスト
 """
 
-import pytest
 from fastapi.testclient import TestClient
 from syrupy.assertion import SnapshotAssertion
 
 
-@pytest.mark.skip(reason="プリセット削除が他のテストに干渉するから")
 def test_post_delete_preset_204(
-    client: TestClient, snapshot_json: SnapshotAssertion
+    client: TestClient, snapshot: SnapshotAssertion
 ) -> None:
     response = client.post("/delete_preset", params={"id": 1})
     assert response.status_code == 204
-    assert snapshot_json == response.json()
+    assert snapshot == response.content
 
 
 def test_post_delete_preset_422(
diff --git a/test/e2e/single_api/test_update_preset.py b/test/e2e/single_api/test_update_preset.py
index 957bd0854..e5dc18821 100644
--- a/test/e2e/single_api/test_update_preset.py
+++ b/test/e2e/single_api/test_update_preset.py
@@ -2,13 +2,13 @@
 /update_preset API のテスト
 """
 
-import pytest
 from fastapi.testclient import TestClient
 from syrupy.assertion import SnapshotAssertion
 
 
-@pytest.mark.skip(reason="プリセット変更が他のテストに干渉するから")
-def test_post_update_preset_200(client: TestClient) -> None:
+def test_post_update_preset_200(
+    client: TestClient, snapshot_json: SnapshotAssertion
+) -> None:
     preset = {
         "id": 1,
         "name": "test_preset",
@@ -23,6 +23,7 @@ def test_post_update_preset_200(client: TestClient) -> None:
     }
     response = client.post("/update_preset", params={}, json=preset)
     assert response.status_code == 200
+    assert snapshot_json == response.json()
 
 
 def test_post_update_preset_422(